Journal•ISSN: 1884-2127
Journal of the Ceramic Association, Japan
Ceramic Society of Japan
About: Journal of the Ceramic Association, Japan is an academic journal. The journal publishes majorly in the area(s): Sintering & Ceramic. It has an ISSN identifier of 1884-2127. Over the lifetime, 1237 publications have been published receiving 6110 citations.
Topics: Sintering, Ceramic, Crystallization, Borosilicate glass, Phase (matter)
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121 citations
TL;DR: Er2O3 as discussed by the authors was the first one to release a 10-6K-1 (850k) and 7.31k-6k-1(850k-1250k) models.
Abstract: 欠陥型ホタル石構造を基本としたC型希土類酸化物のYb2O3とEr2O3の単結晶をアークイメージフローティングゾーン法により作製し, 四軸型単結晶X線回折計を用い, 室温から1260Kまで6点の温度での高温構造の解析を行った. 最終のR因子はYb2O3で0.034から0.050, Er2O3で0.036から0.051であった. 単位胞の平均線熱膨張係数はYb2O3で8.27×10-6K-1 (室温から850K) 及び10.31×10-6K-1 (850Kから1250K), Er2O3で7.47×10-6K-1 (室温から770K) 及び10.74×10-6K-1 (770Kから1250K) である. 欠陥型ホタル石構造における酸素の配列と, 金属-酸素間距離との間の関係並びにその温度依存性について考察した.
79 citations
TL;DR: In this article, photoelectrochemical properties of the TiO2 film electrode have been investigated as a potential candidate for solar energy conversion device, and the results obtained are summarized as follows: (1) the sol-gel derived TiO 2 film shows a very large photocurrent due to porous surface structure and a maximum -14mA cm-2 at about 1.8μm in thickness.
Abstract: TiO2 films up to about 2μm thick have been prepared on a nesa glass substrate by dip-coating technique using the TiO2 sol solution derived from Ti(O-i-C3H7)4. Photoelectrochemical properties of the TiO2 film electrode thus obtained have been investigated as a potential candidate for solar energy conversion device. The results obtained are summarized as follows:(1) The sol-gel derived TiO2 film shows a very large photocurrent due to porous surface structure and a maximum (-14mA cm-2) at about 1.8μm in thickness. A decrease in the photocurrent of the TiO2 film above 1.8μm thick is due to an increase in the resistance.(2) An additional heating at 500°C improves remarkably the photocurrent of the TiO2 film, although too long heating rather deteriorates it. These results are explained on the basis of the changes in the surface structure and carrier concentration with the additional heating time.
67 citations
TL;DR: In this paper, a sol-gel method for the preparation of cordierite ceramics with high homogeneity was described. Butyl-alcohol was used as the starting material for the solgel process and the homogeneity of resultant oxides depended upon the hydrolysis method of alkoxides.
Abstract: A new method for preparing homogeneous cordierite ceramics by a sol-gel process is described. Reactive and fine cordierite-type amorphous powder with high homogeneity was prepared by the sol-gel method. The hydrolysis of metal alkoxides used as starting materials was controlled. Namely, Si(OC2H5)4, with a hydrolysis rate lower than that of Mg (OC2H5)2 or Al (OC3H7i)3, was partially hydrolyzed and then mixed or reacted with Mg and Al alkoxides which had been reacted in butyl-alcohol. The cordierite powders prepared by the sol-gel method were characterized by infrared spectroscopy, X-ray diffraction study, differential thermal analysis (DTA) and transmission electron microscopy (TEM) with an energy dispersion X-ray microprobe analyzer (EDX). Homogeneous cordierite powders were obtained from Mg(OC2H5)2, Al(OC3H7i)3 and Si(OC2H5)4. The homogeneity of resultant oxides depended upon the hydrolysis method of alkoxides.
65 citations
TL;DR: In this article, two rectangular bars of glass-ceramic A-W, its parent glass G, Bioglass Bg or hydroxyapatite ceramic HAp were respectively bound and soaked in an acellular simulated body fluid for various periods up to 6 months.
Abstract: Two rectangular bars of glass-ceramic A-W, its parent glass G, Bioglass Bg or hydroxyapatite ceramic HAp were respectively bound and soaked in an acellular simulated body fluid for various periods up to 6 months. Tight chemical bond was formed between the two bars after a certain period of time for all these bioactive materials. The ability of forming such bond increased in the order HAp
59 citations